/mandos/release : revision 237.16.1

26

* along with this program. If not, see

27

* <http://www.gnu.org/licenses/>.

28

*

29

* Contact the authors at <mandos@fukt.bsnet.se>.

29

* Contact the authors at <mandos@recompile.se>.

30

*/

31

32

/* Needed by GPGME, specifically gpgme_data_seek() */

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

#include <sys/stat.h> /* open() */

56

#include <sys/stat.h> /* open(), S_ISREG */

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect() */

59

#include <fcntl.h> /* open() */

62

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

63

strtoimax() */

64

#include <assert.h> /* assert() */

65

#include <errno.h> /* perror(), errno */

65

#include <errno.h> /* perror(), errno,

66

program_invocation_short_name */

66

67

#include <time.h> /* nanosleep(), time(), sleep() */

67

68

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

68

69

SIOCSIFFLAGS, if_indextoname(),

73

74

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

74

75

getuid(), getgid(), seteuid(),

75

76

setgid(), pause() */

76

#include <arpa/inet.h> /* inet_pton(), htons */

77

#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */

77

78

#include <iso646.h> /* not, or, and */

78

79

#include <argp.h> /* struct argp_option, error_t, struct

79

80

argp_state, struct argp,

122

123

#define PATHDIR "/conf/conf.d/mandos"

123

124

#define SECKEY "seckey.txt"

124

125

#define PUBKEY "pubkey.txt"

126

#define HOOKDIR "/lib/mandos/network-hooks.d"

125

127

126

128

bool debug = false;

127

129

static const char mandos_protocol_version[] = "1";

128

130

const char *argp_program_version = "mandos-client " VERSION;

129

const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

131

const char *argp_program_bug_address = "<mandos@recompile.se>";

130

132

static const char sys_class_net[] = "/sys/class/net";

131

133

char *connect_to = NULL;

132

134

135

/* Doubly linked list that need to be circularly linked when used */

136

typedef struct server{

137

const char *ip;

138

uint16_t port;

139

AvahiIfIndex if_index;

140

int af;

141

struct timespec last_seen;

142

struct server *next;

143

struct server *prev;

144

} server;

145

133

146

/* Used for passing in values through the Avahi callback functions */

134

147

typedef struct {

135

148

AvahiSimplePoll *simple_poll;

139

152

gnutls_dh_params_t dh_params;

140

153

const char *priority;

141

154

gpgme_ctx_t ctx;

155

server *current_server;

142

156

} mandos_context;

143

157

144

158

/* global context so signal handler can reach it*/

145

159

mandos_context mc = { .simple_poll = NULL, .server = NULL,

146

160

.dh_bits = 1024, .priority = "SECURE256"

147

":!CTYPE-X.509:+CTYPE-OPENPGP" };

161

":!CTYPE-X.509:+CTYPE-OPENPGP",

162

.current_server = NULL };

148

163

149

164

sig_atomic_t quit_now = 0;

150

165

int signal_received = 0;

151

166

167

/* Function to use when printing errors */

168

void perror_plus(const char *print_text){

169

fprintf(stderr, "Mandos plugin %s: ",

170

program_invocation_short_name);

171

perror(print_text);

172

}

173

152

174

/*

153

175

* Make additional room in "buffer" for at least BUFFER_SIZE more

154

176

* bytes. "buffer_capacity" is how much is currently allocated,

166

188

return buffer_capacity;

167

189

}

168

190

191

/* Add server to set of servers to retry periodically */

192

int add_server(const char *ip, uint16_t port,

193

AvahiIfIndex if_index,

194

int af){

195

int ret;

196

server *new_server = malloc(sizeof(server));

197

if(new_server == NULL){

198

perror_plus("malloc");

199

return -1;

200

}

201

*new_server = (server){ .ip = strdup(ip),

202

.port = port,

203

.if_index = if_index,

204

.af = af };

205

if(new_server->ip == NULL){

206

perror_plus("strdup");

207

return -1;

208

}

209

/* Special case of first server */

210

if (mc.current_server == NULL){

211

new_server->next = new_server;

212

new_server->prev = new_server;

213

mc.current_server = new_server;

214

/* Place the new server last in the list */

215

} else {

216

new_server->next = mc.current_server;

217

new_server->prev = mc.current_server->prev;

218

new_server->prev->next = new_server;

219

mc.current_server->prev = new_server;

220

}

221

ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);

222

if(ret == -1){

223

perror_plus("clock_gettime");

224

return -1;

225

}

226

return 0;

227

}

228

169

229

/*

170

230

* Initialize GPGME.

171

231

*/

185

245

186

246

fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

187

247

if(fd == -1){

188

perror("open");

248

perror_plus("open");

189

249

return false;

190

250

}

191

251

205

265

206

266

ret = (int)TEMP_FAILURE_RETRY(close(fd));

207

267

if(ret == -1){

208

perror("close");

268

perror_plus("close");

209

269

}

210

270

gpgme_data_release(pgp_data);

211

271

return true;

224

284

return false;

225

285

}

226

286

227

/* Set GPGME home directory for the OpenPGP engine only */

287

/* Set GPGME home directory for the OpenPGP engine only */

228

288

rc = gpgme_get_engine_info(&engine_info);

229

289

if(rc != GPG_ERR_NO_ERROR){

230

290

fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",

336

396

337

397

/* Seek back to the beginning of the GPGME plaintext data buffer */

338

398

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

339

perror("gpgme_data_seek");

399

perror_plus("gpgme_data_seek");

340

400

plaintext_length = -1;

341

401

goto decrypt_end;

342

402

}

347

407

(size_t)plaintext_length,

348

408

plaintext_capacity);

349

409

if(plaintext_capacity == 0){

350

perror("incbuffer");

410

perror_plus("incbuffer");

351

411

plaintext_length = -1;

352

412

goto decrypt_end;

353

413

}

360

420

break;

361

421

}

362

422

if(ret < 0){

363

perror("gpgme_data_read");

423

perror_plus("gpgme_data_read");

364

424

plaintext_length = -1;

365

425

goto decrypt_end;

366

426

}

423

483

}

424

484

425

485

/* OpenPGP credentials */

426

gnutls_certificate_allocate_credentials(&mc.cred);

486

ret = gnutls_certificate_allocate_credentials(&mc.cred);

427

487

if(ret != GNUTLS_E_SUCCESS){

428

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

429

from

430

-Wunreachable-code

431

*/

488

fprintf(stderr, "GnuTLS memory error: %s\n",

432

489

safer_gnutls_strerror(ret));

433

490

gnutls_global_deinit();

434

491

return -1;

589

646

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

647

if(tcp_sd < 0){

591

648

int e = errno;

592

perror("socket");

649

perror_plus("socket");

593

650

errno = e;

594

651

goto mandos_end;

595

652

}

609

666

}

610

667

if(ret < 0 ){

611

668

int e = errno;

612

perror("inet_pton");

669

perror_plus("inet_pton");

613

670

errno = e;

614

671

goto mandos_end;

615

672

}

651

708

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

652

709

char interface[IF_NAMESIZE];

653

710

if(if_indextoname((unsigned int)if_index, interface) == NULL){

654

perror("if_indextoname");

711

perror_plus("if_indextoname");

655

712

} else {

656

713

fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",

657

714

ip, interface, port);

671

728

sizeof(addrstr));

672

729

}

673

730

if(pcret == NULL){

674

perror("inet_ntop");

731

perror_plus("inet_ntop");

675

732

} else {

676

733

if(strcmp(addrstr, ip) != 0){

677

734

fprintf(stderr, "Canonical address form: %s\n", addrstr);

692

749

if(ret < 0){

693

750

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

694

751

int e = errno;

695

perror("connect");

752

perror_plus("connect");

696

753

errno = e;

697

754

}

698

755

goto mandos_end;

711

768

out_size - written));

712

769

if(ret == -1){

713

770

int e = errno;

714

perror("write");

771

perror_plus("write");

715

772

errno = e;

716

773

goto mandos_end;

717

774

}

742

799

goto mandos_end;

743

800

}

744

801

802

/* Spurious warning from -Wint-to-pointer-cast */

745

803

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

804

747

805

if(quit_now){

784

842

buffer_capacity);

785

843

if(buffer_capacity == 0){

786

844

int e = errno;

787

perror("incbuffer");

845

perror_plus("incbuffer");

788

846

errno = e;

789

847

goto mandos_end;

790

848

}

895

953

if(e == 0){

896

954

e = errno;

897

955

}

898

perror("close");

956

perror_plus("close");

899

957

}

900

958

gnutls_deinit(session);

959

errno = e;

901

960

if(quit_now){

902

e = EINTR;

961

errno = EINTR;

903

962

retval = -1;

904

963

}

905

errno = e;

906

964

}

907

965

return retval;

908

966

}

951

1009

avahi_proto_to_af(proto));

952

1010

if(ret == 0){

953

1011

avahi_simple_poll_quit(mc.simple_poll);

1012

} else {

1013

ret = add_server(ip, port, interface,

1014

avahi_proto_to_af(proto));

954

1015

}

955

1016

}

956

1017

}

1010

1071

}

1011

1072

}

1012

1073

1013

/* stop main loop after sigterm has been called */

1074

/* Signal handler that stops main loop after SIGTERM */

1014

1075

static void handle_sigterm(int sig){

1015

1076

if(quit_now){

1016

1077

return;

1018

1079

quit_now = 1;

1019

1080

signal_received = sig;

1020

1081

int old_errno = errno;

1082

/* set main loop to exit */

1021

1083

if(mc.simple_poll != NULL){

1022

1084

avahi_simple_poll_quit(mc.simple_poll);

1023

1085

}

1024

1086

errno = old_errno;

1025

1087

}

1026

1088

1027

/*

1028

* This function determines if a directory entry in /sys/class/net

1029

* corresponds to an acceptable network device.

1030

* (This function is passed to scandir(3) as a filter function.)

1031

*/

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

if(if_entry->d_name[0] == '.'){

1042

return 0;

1043

}

1044

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1050

/* read line from flags_fd */

1051

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1052

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1053

flagstring[(size_t)to_read] = '\0';

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

tmpmax = strtoimax(flagstring, &tmp, 0);

1078

if(errno != 0 or tmp == flagstring or (*tmp != '\0'

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1089

bool get_flags(const char *ifname, struct ifreq *ifr){

1090

int ret;

1091

1092

int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1093

if(s < 0){

1094

perror_plus("socket");

1095

return false;

1096

}

1097

strcpy(ifr->ifr_name, ifname);

1098

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1099

if(ret == -1){

1081

1100

if(debug){

1082

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1083

flagstring, if_entry->d_name);

1101

perror_plus("ioctl SIOCGIFFLAGS");

1084

1102

}

1085

free(flagstring);

1086

return 0;

1103

return false;

1087

1104

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1105

return true;

1106

}

1107

1108

bool good_flags(const char *ifname, const struct ifreq *ifr){

1109

1090

1110

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1111

if(ifr->ifr_flags & IFF_LOOPBACK){

1092

1112

if(debug){

1093

1113

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1094

if_entry->d_name);

1114

ifname);

1095

1115

}

1096

return 0;

1116

return false;

1097

1117

}

1098

1118

/* Accept point-to-point devices only if connect_to is specified */

1099

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1119

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1100

1120

if(debug){

1101

1121

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1102

if_entry->d_name);

1122

ifname);

1103

1123

}

1104

return 1;

1124

return true;

1105

1125

}

1106

1126

/* Otherwise, reject non-broadcast-capable devices */

1107

if(not (flags & IFF_BROADCAST)){

1127

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1108

1128

if(debug){

1109

1129

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1130

ifname);

1131

}

1132

return false;

1133

}

1134

/* Reject non-ARP interfaces (including dummy interfaces) */

1135

if(ifr->ifr_flags & IFF_NOARP){

1136

if(debug){

1137

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);

1138

}

1139

return false;

1140

}

1141

1114

1142

/* Accept this device */

1115

1143

if(debug){

1116

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1117

if_entry->d_name);

1118

}

1119

return 1;

1144

fprintf(stderr, "Interface \"%s\" is good\n", ifname);

1145

}

1146

return true;

1147

}

1148

1149

/*

1150

* This function determines if a directory entry in /sys/class/net

1151

* corresponds to an acceptable network device.

1152

* (This function is passed to scandir(3) as a filter function.)

1153

*/

1154

int good_interface(const struct dirent *if_entry){

1155

if(if_entry->d_name[0] == '.'){

1156

return 0;

1157

}

1158

1159

struct ifreq ifr;

1160

if(not get_flags(if_entry->d_name, &ifr)){

1161

if(debug){

1162

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1163

if_entry->d_name);

1164

}

1165

return 0;

1166

}

1167

1168

if(not good_flags(if_entry->d_name, &ifr)){

1169

return 0;

1170

}

1171

return 1;

1172

}

1173

1174

/*

1175

* This function determines if a directory entry in /sys/class/net

1176

* corresponds to an acceptable network device which is up.

1177

* (This function is passed to scandir(3) as a filter function.)

1178

*/

1179

int up_interface(const struct dirent *if_entry){

1180

if(if_entry->d_name[0] == '.'){

1181

return 0;

1182

}

1183

1184

struct ifreq ifr;

1185

if(not get_flags(if_entry->d_name, &ifr)){

1186

if(debug){

1187

fprintf(stderr, "Failed to get flags for interface \"%s\"\n",

1188

if_entry->d_name);

1189

}

1190

return 0;

1191

}

1192

1193

/* Reject down interfaces */

1194

if(not (ifr.ifr_flags & IFF_UP)){

1195

if(debug){

1196

fprintf(stderr, "Rejecting down interface \"%s\"\n",

1197

if_entry->d_name);

1198

}

1199

return 0;

1200

}

1201

1202

/* Reject non-running interfaces */

1203

if(not (ifr.ifr_flags & IFF_RUNNING)){

1204

if(debug){

1205

fprintf(stderr, "Rejecting non-running interface \"%s\"\n",

1206

if_entry->d_name);

1207

}

1208

return 0;

1209

}

1210

1211

if(not good_flags(if_entry->d_name, &ifr)){

1212

return 0;

1213

}

1214

return 1;

1215

}

1216

1217

int notdotentries(const struct dirent *direntry){

1218

/* Skip "." and ".." */

1219

if(direntry->d_name[0] == '.'

1220

and (direntry->d_name[1] == '\0'

1221

or (direntry->d_name[1] == '.'

1222

and direntry->d_name[2] == '\0'))){

1223

return 0;

1224

}

1225

return 1;

1226

}

1227

1228

/* Is this directory entry a runnable program? */

1229

int runnable_hook(const struct dirent *direntry){

1230

int ret;

1231

struct stat st;

1232

1233

if((direntry->d_name)[0] == '\0'){

1234

/* Empty name? */

1235

return 0;

1236

}

1237

1238

/* Save pointer to last character */

1239

char *end = strchr(direntry->d_name, '\0')-1;

1240

1241

if(*end == '~'){

1242

/* Backup name~ */

1243

return 0;

1244

}

1245

1246

if(((direntry->d_name)[0] == '#')

1247

and (*end == '#')){

1248

/* Temporary #name# */

1249

return 0;

1250

}

1251

1252

/* XXX more rules here */

1253

1254

ret = stat(direntry->d_name, &st);

1255

if(ret == -1){

1256

if(debug){

1257

perror_plus("Could not stat plugin");

1258

}

1259

return 0;

1260

}

1261

if(not (S_ISREG(st.st_mode))){

1262

/* Not a regular file */

1263

return 0;

1264

}

1265

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1266

/* Not executable */

1267

return 0;

1268

}

1269

return 1;

1270

}

1271

1272

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1273

int ret;

1274

struct timespec now;

1275

struct timespec waited_time;

1276

intmax_t block_time;

1277

1278

while(true){

1279

if(mc.current_server == NULL){

1280

if (debug){

1281

fprintf(stderr,

1282

"Wait until first server is found. No timeout!\n");

1283

}

1284

ret = avahi_simple_poll_iterate(s, -1);

1285

} else {

1286

if (debug){

1287

fprintf(stderr, "Check current_server if we should run it,"

1288

" or wait\n");

1289

}

1290

/* the current time */

1291

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1292

if(ret == -1){

1293

perror_plus("clock_gettime");

1294

return -1;

1295

}

1296

/* Calculating in ms how long time between now and server

1297

who we visted longest time ago. Now - last seen. */

1298

waited_time.tv_sec = (now.tv_sec

1299

- mc.current_server->last_seen.tv_sec);

1300

waited_time.tv_nsec = (now.tv_nsec

1301

- mc.current_server->last_seen.tv_nsec);

1302

/* total time is 10s/10,000ms.

1303

Converting to s from ms by dividing by 1,000,

1304

and ns to ms by dividing by 1,000,000. */

1305

block_time = ((retry_interval

1306

- ((intmax_t)waited_time.tv_sec * 1000))

1307

- ((intmax_t)waited_time.tv_nsec / 1000000));

1308

1309

if (debug){

1310

fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);

1311

}

1312

1313

if(block_time <= 0){

1314

ret = start_mandos_communication(mc.current_server->ip,

1315

mc.current_server->port,

1316

mc.current_server->if_index,

1317

mc.current_server->af);

1318

if(ret == 0){

1319

avahi_simple_poll_quit(mc.simple_poll);

1320

return 0;

1321

}

1322

ret = clock_gettime(CLOCK_MONOTONIC,

1323

&mc.current_server->last_seen);

1324

if(ret == -1){

1325

perror_plus("clock_gettime");

1326

return -1;

1327

}

1328

mc.current_server = mc.current_server->next;

1329

block_time = 0; /* Call avahi to find new Mandos

1330

servers, but don't block */

1331

}

1332

1333

ret = avahi_simple_poll_iterate(s, (int)block_time);

1334

}

1335

if(ret != 0){

1336

if (ret > 0 or errno != EINTR) {

1337

return (ret != 1) ? ret : 0;

1338

}

1339

}

1340

}

1120

1341

}

1121

1342

1122

1343

int main(int argc, char *argv[]){

1141

1362

bool gnutls_initialized = false;

1142

1363

bool gpgme_initialized = false;

1143

1364

float delay = 2.5f;

1365

double retry_interval = 10; /* 10s between trying a server and

1366

retrying the same server again */

1144

1367

1145

1368

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1146

1369

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1152

1375

errno = 0;

1153

1376

ret = setgid(gid);

1154

1377

if(ret == -1){

1155

perror("setgid");

1378

perror_plus("setgid");

1156

1379

}

1157

1380

1158

1381

/* Lower user privileges (temporarily) */

1159

1382

errno = 0;

1160

1383

ret = seteuid(uid);

1161

1384

if(ret == -1){

1162

perror("seteuid");

1385

perror_plus("seteuid");

1163

1386

}

1164

1387

1165

1388

if(quit_now){

1200

1423

.arg = "SECONDS",

1201

1424

.doc = "Maximum delay to wait for interface startup",

1202

1425

.group = 2 },

1426

{ .name = "retry", .key = 132,

1427

.arg = "SECONDS",

1428

.doc = "Retry interval used when denied by the mandos server",

1429

.group = 2 },

1203

1430

/*

1204

1431

* These reproduce what we would get without ARGP_NO_HELP

1205

1432

*/

1249

1476

if(errno != 0 or tmp == arg or *tmp != '\0'){

1250

1477

argp_error(state, "Bad delay");

1251

1478

}

1479

case 132: /* --retry */

1480

errno = 0;

1481

retry_interval = strtod(arg, &tmp);

1482

if(errno != 0 or tmp == arg or *tmp != '\0'

1483

or (retry_interval * 1000) > INT_MAX

1484

or retry_interval < 0){

1485

argp_error(state, "Bad retry interval");

1486

}

1252

1487

break;

1253

1488

/*

1254

1489

* These reproduce what we would get without ARGP_NO_HELP

1282

1517

case ENOMEM:

1283

1518

default:

1284

1519

errno = ret;

1285

perror("argp_parse");

1520

perror_plus("argp_parse");

1286

1521

exitcode = EX_OSERR;

1287

1522

goto end;

1288

1523

case EINVAL:

1290

1525

goto end;

1291

1526

}

1292

1527

}

1528

1529

{

1530

/* Work around Debian bug #633582:

1531

<http://bugs.debian.org/633582> */

1532

struct stat st;

1533

1534

/* Re-raise priviliges */

1535

errno = 0;

1536

ret = seteuid(0);

1537

if(ret == -1){

1538

perror_plus("seteuid");

1539

}

1540

1541

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

1542

int seckey_fd = open(seckey, O_RDONLY);

1543

if(seckey_fd == -1){

1544

perror_plus("open");

1545

} else {

1546

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

1547

if(ret == -1){

1548

perror_plus("fstat");

1549

} else {

1550

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1551

ret = fchown(seckey_fd, uid, gid);

1552

if(ret == -1){

1553

perror_plus("fchown");

1554

}

1555

}

1556

}

1557

TEMP_FAILURE_RETRY(close(seckey_fd));

1558

}

1559

}

1560

1561

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

1562

int pubkey_fd = open(pubkey, O_RDONLY);

1563

if(pubkey_fd == -1){

1564

perror_plus("open");

1565

} else {

1566

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

1567

if(ret == -1){

1568

perror_plus("fstat");

1569

} else {

1570

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1571

ret = fchown(pubkey_fd, uid, gid);

1572

if(ret == -1){

1573

perror_plus("fchown");

1574

}

1575

}

1576

}

1577

TEMP_FAILURE_RETRY(close(pubkey_fd));

1578

}

1579

}

1580

1581

/* Lower privileges */

1582

errno = 0;

1583

ret = seteuid(uid);

1584

if(ret == -1){

1585

perror_plus("seteuid");

1586

}

1587

}

1588

1589

/* Find network hooks and run them */

1590

{

1591

struct dirent **direntries;

1592

struct dirent *direntry;

1593

int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,

1594

alphasort);

1595

int devnull = open("/dev/null", O_RDONLY);

1596

for(int i = 0; i < numhooks; i++){

1597

direntry = direntries[0];

1598

char *fullname = NULL;

1599

ret = asprintf(&fullname, "%s/%s", tempdir,

1600

direntry->d_name);

1601

if(ret < 0){

1602

perror_plus("asprintf");

1603

continue;

1604

}

1605

pid_t hook_pid = fork();

1606

if(hook_pid == 0){

1607

/* Child */

1608

dup2(devnull, STDIN_FILENO);

1609

close(devnull);

1610

dup2(STDERR_FILENO, STDOUT_FILENO);

1611

setenv("DEVICE", interface, 1);

1612

setenv("VERBOSE", debug ? "1" : "0", 1);

1613

setenv("MODE", "start", 1);

1614

/* setenv( XXX more here */

1615

ret = execl(fullname, direntry->d_name, "start", NULL);

1616

perror_plus("execl");

1617

}

1618

free(fullname);

1619

if(quit_now){

1620

goto end;

1621

}

1622

}

1623

close(devnull);

1624

}

1293

1625

1294

1626

if(not debug){

1295

1627

avahi_set_log_function(empty_log);

1296

1628

}

1297

1629

1298

1630

if(interface[0] == '\0'){

1299

1631

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1632

/* First look for interfaces that are up */

1633

ret = scandir(sys_class_net, &direntries, up_interface,

1301

1634

alphasort);

1635

if(ret == 0){

1636

/* No up interfaces, look for any good interfaces */

1637

free(direntries);

1638

ret = scandir(sys_class_net, &direntries, good_interface,

1639

alphasort);

1640

}

1302

1641

if(ret >= 1){

1303

/* Pick the first good interface */

1642

/* Pick the first interface returned */

1304

1643

interface = strdup(direntries[0]->d_name);

1305

1644

if(debug){

1306

1645

fprintf(stderr, "Using interface \"%s\"\n", interface);

1307

1646

}

1308

1647

if(interface == NULL){

1309

perror("malloc");

1648

perror_plus("malloc");

1310

1649

free(direntries);

1311

1650

exitcode = EXIT_FAILURE;

1312

1651

goto end;

1334

1673

sigemptyset(&sigterm_action.sa_mask);

1335

1674

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1336

1675

if(ret == -1){

1337

perror("sigaddset");

1676

perror_plus("sigaddset");

1338

1677

exitcode = EX_OSERR;

1339

1678

goto end;

1340

1679

}

1341

1680

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1342

1681

if(ret == -1){

1343

perror("sigaddset");

1682

perror_plus("sigaddset");

1344

1683

exitcode = EX_OSERR;

1345

1684

goto end;

1346

1685

}

1347

1686

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1348

1687

if(ret == -1){

1349

perror("sigaddset");

1688

perror_plus("sigaddset");

1350

1689

exitcode = EX_OSERR;

1351

1690

goto end;

1352

1691

}

1356

1695

*/

1357

1696

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1358

1697

if(ret == -1){

1359

perror("sigaction");

1698

perror_plus("sigaction");

1360

1699

return EX_OSERR;

1361

1700

}

1362

1701

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

1702

ret = sigaction(SIGINT, &sigterm_action, NULL);

1364

1703

if(ret == -1){

1365

perror("sigaction");

1704

perror_plus("sigaction");

1366

1705

exitcode = EX_OSERR;

1367

1706

goto end;

1368

1707

}

1369

1708

}

1370

1709

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1371

1710

if(ret == -1){

1372

perror("sigaction");

1711

perror_plus("sigaction");

1373

1712

return EX_OSERR;

1374

1713

}

1375

1714

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

1715

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1377

1716

if(ret == -1){

1378

perror("sigaction");

1717

perror_plus("sigaction");

1379

1718

exitcode = EX_OSERR;

1380

1719

goto end;

1381

1720

}

1382

1721

}

1383

1722

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1384

1723

if(ret == -1){

1385

perror("sigaction");

1724

perror_plus("sigaction");

1386

1725

return EX_OSERR;

1387

1726

}

1388

1727

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

1728

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1390

1729

if(ret == -1){

1391

perror("sigaction");

1730

perror_plus("sigaction");

1392

1731

exitcode = EX_OSERR;

1393

1732

goto end;

1394

1733

}

1411

1750

errno = 0;

1412

1751

ret = seteuid(0);

1413

1752

if(ret == -1){

1414

perror("seteuid");

1753

perror_plus("seteuid");

1415

1754

}

1416

1755

1417

1756

#ifdef __linux__

1421

1760

bool restore_loglevel = true;

1422

1761

if(ret == -1){

1423

1762

restore_loglevel = false;

1424

perror("klogctl");

1763

perror_plus("klogctl");

1425

1764

}

1426

1765

#endif /* __linux__ */

1427

1766

1428

1767

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

1768

if(sd < 0){

1430

perror("socket");

1769

perror_plus("socket");

1431

1770

exitcode = EX_OSERR;

1432

1771

#ifdef __linux__

1433

1772

if(restore_loglevel){

1434

1773

ret = klogctl(7, NULL, 0);

1435

1774

if(ret == -1){

1436

perror("klogctl");

1775

perror_plus("klogctl");

1437

1776

}

1438

1777

}

1439

1778

#endif /* __linux__ */

1441

1780

errno = 0;

1442

1781

ret = seteuid(uid);

1443

1782

if(ret == -1){

1444

perror("seteuid");

1783

perror_plus("seteuid");

1445

1784

}

1446

1785

goto end;

1447

1786

}

1448

1787

strcpy(network.ifr_name, interface);

1449

1788

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1450

1789

if(ret == -1){

1451

perror("ioctl SIOCGIFFLAGS");

1790

perror_plus("ioctl SIOCGIFFLAGS");

1452

1791

#ifdef __linux__

1453

1792

if(restore_loglevel){

1454

1793

ret = klogctl(7, NULL, 0);

1455

1794

if(ret == -1){

1456

perror("klogctl");

1795

perror_plus("klogctl");

1457

1796

}

1458

1797

}

1459

1798

#endif /* __linux__ */

1462

1801

errno = 0;

1463

1802

ret = seteuid(uid);

1464

1803

if(ret == -1){

1465

perror("seteuid");

1804

perror_plus("seteuid");

1466

1805

}

1467

1806

goto end;

1468

1807

}

1472

1811

ret = ioctl(sd, SIOCSIFFLAGS, &network);

1473

1812

if(ret == -1){

1474

1813

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1814

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1476

1815

exitcode = EX_OSERR;

1477

1816

#ifdef __linux__

1478

1817

if(restore_loglevel){

1479

1818

ret = klogctl(7, NULL, 0);

1480

1819

if(ret == -1){

1481

perror("klogctl");

1820

perror_plus("klogctl");

1482

1821

}

1483

1822

}

1484

1823

#endif /* __linux__ */

1486

1825

errno = 0;

1487

1826

ret = seteuid(uid);

1488

1827

if(ret == -1){

1489

perror("seteuid");

1828

perror_plus("seteuid");

1490

1829

}

1491

1830

goto end;

1492

1831

}

1493

1832

}

1494

/* sleep checking until interface is running */

1833

/* Sleep checking until interface is running.

1834

Check every 0.25s, up to total time of delay */

1495

1835

for(int i=0; i < delay * 4; i++){

1496

1836

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1497

1837

if(ret == -1){

1498

perror("ioctl SIOCGIFFLAGS");

1838

perror_plus("ioctl SIOCGIFFLAGS");

1499

1839

} else if(network.ifr_flags & IFF_RUNNING){

1500

1840

break;

1501

1841

}

1502

1842

struct timespec sleeptime = { .tv_nsec = 250000000 };

1503

1843

ret = nanosleep(&sleeptime, NULL);

1504

1844

if(ret == -1 and errno != EINTR){

1505

perror("nanosleep");

1845

perror_plus("nanosleep");

1506

1846

}

1507

1847

}

1508

1848

if(not take_down_interface){

1509

1849

/* We won't need the socket anymore */

1510

1850

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1511

1851

if(ret == -1){

1512

perror("close");

1852

perror_plus("close");

1513

1853

}

1514

1854

}

1515

1855

#ifdef __linux__

1517

1857

/* Restores kernel loglevel to default */

1518

1858

ret = klogctl(7, NULL, 0);

1519

1859

if(ret == -1){

1520

perror("klogctl");

1860

perror_plus("klogctl");

1521

1861

}

1522

1862

}

1523

1863

#endif /* __linux__ */

1527

1867

/* Lower privileges */

1528

1868

ret = seteuid(uid);

1529

1869

if(ret == -1){

1530

perror("seteuid");

1870

perror_plus("seteuid");

1531

1871

}

1532

1872

} else {

1533

1873

/* Lower privileges permanently */

1534

1874

ret = setuid(uid);

1535

1875

if(ret == -1){

1536

perror("setuid");

1876

perror_plus("setuid");

1537

1877

}

1538

1878

}

1539

1879

}

1555

1895

goto end;

1556

1896

}

1557

1897

1898

if(mkdtemp(tempdir) == NULL){

1899

perror_plus("mkdtemp");

1900

goto end;

1901

}

1558

1902

tempdir_created = true;

1559

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

perror("mkdtemp");

1562

goto end;

1563

}

1564

1903

1565

1904

if(quit_now){

1566

1905

goto end;

1608

1947

1609

1948

port = (uint16_t)tmpmax;

1610

1949

*address = '\0';

1611

address = connect_to;

1612

1950

/* Colon in address indicates IPv6 */

1613

1951

int af;

1614

if(strchr(address, ':') != NULL){

1952

if(strchr(connect_to, ':') != NULL){

1615

1953

af = AF_INET6;

1954

/* Accept [] around IPv6 address - see RFC 5952 */

1955

if(connect_to[0] == '[' and address[-1] == ']')

1956

{

1957

connect_to++;

1958

address[-1] = '\0';

1959

}

1616

1960

} else {

1617

1961

af = AF_INET;

1618

1962

}

1963

address = connect_to;

1619

1964

1620

1965

if(quit_now){

1621

1966

goto end;

1622

1967

}

1623

1968

1624

1969

while(not quit_now){

1625

1970

ret = start_mandos_communication(address, port, if_index, af);

1626

1971

if(quit_now or ret == 0){

1627

1972

break;

1628

1973

}

1629

sleep(15);

1630

};

1631

1974

if(debug){

1975

fprintf(stderr, "Retrying in %d seconds\n",

1976

(int)retry_interval);

1977

}

1978

sleep((int)retry_interval);

1979

}

1980

1632

1981

if (not quit_now){

1633

1982

exitcode = EXIT_SUCCESS;

1634

1983

}

1635

1984

1636

1985

goto end;

1637

1986

}

1638

1987

1690

2039

if(debug){

1691

2040

fprintf(stderr, "Starting Avahi loop search\n");

1692

2041

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

2042

2043

ret = avahi_loop_with_timeout(mc.simple_poll,

2044

(int)(retry_interval * 1000));

2045

if(debug){

2046

fprintf(stderr, "avahi_loop_with_timeout exited %s\n",

2047

(ret == 0) ? "successfully" : "with error");

2048

}

1695

2049

1696

2050

end:

1697

2051

1718

2072

if(gpgme_initialized){

1719

2073

gpgme_release(mc.ctx);

1720

2074

}

2075

2076

/* Cleans up the circular linked list of Mandos servers the client

2077

has seen */

2078

if(mc.current_server != NULL){

2079

mc.current_server->prev->next = NULL;

2080

while(mc.current_server != NULL){

2081

server *next = mc.current_server->next;

2082

free(mc.current_server);

2083

mc.current_server = next;

2084

}

2085

}

2086

2087

/* XXX run network hooks "stop" here */

1721

2088

1722

2089

/* Take down the network interface */

1723

2090

if(take_down_interface){

1725

2092

errno = 0;

1726

2093

ret = seteuid(0);

1727

2094

if(ret == -1){

1728

perror("seteuid");

2095

perror_plus("seteuid");

1729

2096

}

1730

2097

if(geteuid() == 0){

1731

2098

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1732

2099

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

2100

perror_plus("ioctl SIOCGIFFLAGS");

1734

2101

} else if(network.ifr_flags & IFF_UP) {

1735

2102

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

1736

2103

ret = ioctl(sd, SIOCSIFFLAGS, &network);

1737

2104

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

2105

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1739

2106

}

1740

2107

}

1741

2108

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1742

2109

if(ret == -1){

1743

perror("close");

2110

perror_plus("close");

1744

2111

}

1745

2112

/* Lower privileges permanently */

1746

2113

errno = 0;

1747

2114

ret = setuid(uid);

1748

2115

if(ret == -1){

1749

perror("setuid");

2116

perror_plus("setuid");

1750

2117

}

1751

2118

}

1752

2119

}

1753

2120

1754

/* Removes the temp directory used by GPGME */

2121

/* Removes the GPGME temp directory and all files inside */

1755

2122

if(tempdir_created){

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

/* Skip "." and ".." */

1770

if(direntry->d_name[0] == '.'

1771

and (direntry->d_name[1] == '\0'

1772

or (direntry->d_name[1] == '.'

1773

and direntry->d_name[2] == '\0'))){

1774

continue;

1775

}

2123

struct dirent **direntries = NULL;

2124

struct dirent *direntry = NULL;

2125

int numentries = scandir(tempdir, &direntries, notdotentries,

2126

alphasort);

2127

if (numentries > 0){

2128

for(int i = 0; i < numentries; i++){

2129

direntry = direntries[i];

1776

2130

char *fullname = NULL;

1777

2131

ret = asprintf(&fullname, "%s/%s", tempdir,

1778

2132

direntry->d_name);

1779

2133

if(ret < 0){

1780

perror("asprintf");

2134

perror_plus("asprintf");

1781

2135

continue;

1782

2136

}

1783

2137

ret = remove(fullname);

1787

2141

}

1788

2142

free(fullname);

1789

2143

}

1790

closedir(d);

2144

}

2145

2146

/* need to clean even if 0 because man page doesn't specify */

2147

free(direntries);

2148

if (numentries == -1){

2149

perror_plus("scandir");

1791

2150

}

1792

2151

ret = rmdir(tempdir);

1793

2152

if(ret == -1 and errno != ENOENT){

1794

perror("rmdir");

2153

perror_plus("rmdir");

1795

2154

}

1796

2155

}

1797

2156

1802

2161

&old_sigterm_action,

1803

2162

NULL));

1804

2163

if(ret == -1){

1805

perror("sigaction");

2164

perror_plus("sigaction");

1806

2165

}

1807

2166

do {

1808

2167

ret = raise(signal_received);

1809

2168

} while(ret != 0 and errno == EINTR);

1810

2169

if(ret != 0){

1811

perror("raise");

2170

perror_plus("raise");

1812

2171

abort();

1813

2172

}

1814

2173

TEMP_FAILURE_RETRY(pause());